163405920 has 48 divisors (see below), whose sum is σ = 514730160. Its totient is φ = 43574784.

The previous prime is 163405903. The next prime is 163405999. The reversal of 163405920 is 29504361.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169735 + ... + 170694.

It is an arithmetic number, because the mean of its divisors is an integer number (10723545).

Almost surely, 2^163405920 is an apocalyptic number.

163405920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163405920 is an abundant number, since it is smaller than the sum of its proper divisors (351324240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163405920 is a wasteful number, since it uses less digits than its factorization.

163405920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340447 (or 340439 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 163405920 is about 12783.0325040657. The cubic root of 163405920 is about 546.7086292066.

The spelling of 163405920 in words is "one hundred sixty-three million, four hundred five thousand, nine hundred twenty".